diff --git a/docs/swi.tex b/docs/swi.tex
index cdf64cbd0..6240ad1cd 100644
--- a/docs/swi.tex
+++ b/docs/swi.tex
@@ -140,7 +140,7 @@ the end of the list or @var{Pred} fails. In the latter case
 @findex maplist/3
 @snindex maplist/3
 @cnindex maplist/3
-Apply @var{Pred} on all successive triples of elements from
+Apply @var{Pred} on all successive pairs of elements from
 @var{List1} and
 @var{List2}. Fails if @var{Pred} can not be applied to a
 pair. See the example above.